Andy,
As I just saw your contribution to the addons: r.cell.area [1], please
all note that 10 months ago MarkusM has implemented an area() function
in r.mapcalc [2]. This is currently only available in trunk, but will
thus be in GRASS GIS 7.4. This uses internal library functions which
calculate area of the pixel taking into account the current projection
system.
Moritz
[1] https://trac.osgeo.org/grass/changeset/71487
[2]
https://trac.osgeo.org/grass/changeset/69962/grass/trunk/raster/r.mapcalc
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